Ever wonder what those small numbers on the bottom of your plastic bottles and takeout containers mean? They're called Resin Identification Codes. Follow BI Video: On Twitter More from Science ...

Cut the bottom four inches off a 1/2-gallon plastic ... Probably the easiest method for making DIY free weights is ...

Doing what he does best, Bill Hammack, AKA The Engineer Guy, spends an enlightening 13 minutes explaining not only how two-liter plastic soda bottles ... on the top and bottom of each bottle ...